GLX_AMD_gpu_association
http://www.opengl.org/registry/specs/AMD/glx_gpu_association.txt
GLX_AMD_gpu_association
	GLX_GPU_VENDOR_AMD 0x1F00
	GLX_GPU_RENDERER_STRING_AMD 0x1F01
	GLX_GPU_OPENGL_VERSION_STRING_AMD 0x1F02
	GLX_GPU_FASTEST_TARGET_GPUS_AMD 0x21A2
	GLX_GPU_RAM_AMD 0x21A3
	GLX_GPU_CLOCK_AMD 0x21A4
	GLX_GPU_NUM_PIPES_AMD 0x21A5
	GLX_GPU_NUM_SIMD_AMD 0x21A6
	GLX_GPU_NUM_RB_AMD 0x21A7
	GLX_GPU_NUM_SPI_AMD 0x21A8